Plz help me with this one..I don't really know and I would be very greatful if I would get the help (in english)
the electrical circuit consists of a generator with a TEM of 15 V, the ammeter and a consumer of electricity with a resistance of 4000 m Ohm. The ammeter indicates the current intensity of 3 A. Determine the internal resistance of the generator.
(in romanian)
Circuitul electric este format dintr-un generator cu TEM de 15 V, ampermetru și un consumator de energie electrică cu o rezistență de 4000 m Ohmi. Amperimetrul indică intensitatea curentului de 3 A. Determinați rezistența internă a generatorului.

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?

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